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Method and application of preparing high-purity multicolor carbon dots by adjusting the morphology of carbon nanocrystals

A carbon nanocrystal and high-purity technology, applied in nanocarbon, nanotechnology, nanotechnology, etc., can solve the problems of difficult industrial production and low purity of carbon quantum dots, and achieve good biocompatibility, low cytotoxicity, The effect of high purity

Inactive Publication Date: 2020-11-06
四川中科微纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the carbon quantum dots prepared by the existing hydrothermal carbon quantum dot preparation method have low purity and are not easy to be industrialized. The method and application of color carbon dots, solving the problem of new preparation methods of carbon quantum dots

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  • Method and application of preparing high-purity multicolor carbon dots by adjusting the morphology of carbon nanocrystals
  • Method and application of preparing high-purity multicolor carbon dots by adjusting the morphology of carbon nanocrystals
  • Method and application of preparing high-purity multicolor carbon dots by adjusting the morphology of carbon nanocrystals

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Embodiment 1

[0046] The method and application of the present invention for preparing high-purity multicolor carbon dots by regulating the morphology of carbon nanocrystals comprises the following steps:

[0047] (1) Weigh 0.22g o-aminophenol, measure 20ml alcohol solution, and dissolve o-aminophenol in the alcohol solution;

[0048] (2) After the undissolved part of o-aminophenol was ultrasonically treated for 15 minutes, after it was completely dissolved, it was transferred to a 50ml polytetrafluoroethylene-lined hydrothermal synthesis kettle, and reacted in a muffle furnace at 170°C for 16 hours;

[0049] (3) After the reaction, a tan solution with fine suspended particles was obtained. After the solution was centrifuged at 4000r / min, the lower layer of solid was removed and dried to obtain carbon quantum dot nanocrystals.

[0050] (4) High-purity multicolor carbon dots can be prepared by dissolving carbon nanocrystals in corresponding polar solvents.

[0051] Wherein, the volume ratio...

Embodiment 2

[0055] The present invention adopts the existing hydrothermal preparation process:

[0056] (1) Weigh 0.22g o-aminophenol, measure 20ml alcohol solution, and dissolve o-aminophenol in the alcohol solution;

[0057] (2) After the undissolved part of o-aminophenol was ultrasonically treated for 15 minutes, after it was completely dissolved, it was transferred to a 50ml polytetrafluoroethylene-lined hydrothermal synthesis kettle, and reacted in a muffle furnace at 170°C for 16 hours;

[0058] (3) Rotate the above solution to remove ethanol, control the rotary evaporation conditions as follows: temperature 35°C, vacuum degree 0.085MPa, rotation speed 100rpm; dissolve in secondary water, centrifuge to remove insoluble matter, dialyze for three days, freeze-dry to obtain carbon quantum Dot powder.

[0059] By comparison with Example 1, it can be seen that Example 2 is an existing method for preparing carbon dots, and the quantum yield of carbon dots obtained by it is lower than tha...

Embodiment 3

[0061] Carry out high-resolution transmission electron microscope (TEM) and atomic force microscope (AFM) characterization to the carbon quantum dot gained in embodiment 1, as figure 2 , image 3 shown.

[0062] figure 2 TEM image of multicolor fluorescent carbon quantum dots, figure 2 The abscissa in b is: particle size statistics (nm); the ordinate is: the proportion of various particle sizes; image 3 AFM image of multicolor fluorescent carbon quantum dots;

[0063] It can be found from the characterization diagrams of TEM and AFM that the multicolor fluorescent carbon quantum dot crystals prepared by the present invention are neatly arranged and there is no obvious aggregation on the surface. from figure 2 It can be seen from the TEM particle diameter distribution diagram in the figure that the particle diameter of the carbon quantum dots is distributed in the range of 1nm to 4nm, and the atomic force microscope diagram ( image 3 ) shows that the multicolor fluo...

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Abstract

The invention discloses a method for preparing high-purity multicolor carbon dots by regulating and controlling the appearance of carbon nanocrystals and an application of the method. The method comprises the following steps: a) weighing 0.2-0.3 g of o-aminophenol, metering 18-22 ml of an alcohol solution, and dissolving the o-aminophenol in the alcohol solution; b) after the o-aminophenol is completely dissolved, transferring the solution into a 50 ml hydrothermal synthesis kettle with polytetrafluoroethylene lining to perform a reaction for 15-18 hours in a muffle furnace at the temperatureof 150-180 DEG C, thus forming a brown solution with fine suspended particles after the reaction is finished; and c) centrifuging the solution at 4000 r / min, collecting a solid from bottom layer, anddrying the solid to obtain the carbon nanocrystals, and d) dissolving the carbon nanocrystals in a solvent with corresponding polarity to prepare the high-purity multicolor carbon dots. The preparation method has the advantages of simple, cheap and easily available raw materials, mild experimental conditions, no complicated steps, convenience and easiness in operation.

Description

technical field [0001] The invention relates to the field of carbon quantum dots, in particular to a method and application for preparing high-purity multicolor carbon dots by regulating the morphology of carbon nanocrystals. Background technique [0002] In recent years, carbon quantum dots have attracted much attention due to their good optical properties and biological applications. As an emerging zero-dimensional material, carbon quantum dots show superior properties compared with traditional semiconductor quantum dots, such as small particle size, strong fluorescence, good photostability, high biocompatibility, low toxicity, and environmental friendliness. It is widely used in biological imaging, medical diagnosis, drug carrier, catalysis, optoelectronic devices and other fields. [0003] Among them, its fluorescence properties are most widely used in the fields of bioimaging and biomarkers. At present, there are many preparation methods of carbon quantum dots, such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C09K11/65B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01B32/15C09K11/65
Inventor 霍峰李果刘宇航蒋志李文琼胡猛
Owner 四川中科微纳科技有限公司
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